1937 Christmas Seal

The two images show the front and back of a postcard mailed with the 1936-37 christmas seal tied by San Francisco cancel and also shows a PAQUEBOT cancel with San. Fran. Calif. The view card show the N.Y.K. Line S.S. Taiyo Maru. This is the first usage of a Christmas seal that I have seen used during the proper time period and tied to the cover. The PAQUEBOT marking gives it an additional flavor.